Letrozole Related Compounds & Impurities

Letrozole is a potent non-steroidal aromatase inhibitor used for hormone receptor-positive breast cancer in postmenopausal women and ovulation induction.

Simson Pharma Limited along with its subsidiary offices Simson Pharma Global Ltd. (UK) and Simson Pharma Global LLC (USA) is a trusted manufacturer and supplier of high-quality pharmaceutical reference standards, offering a comprehensive portfolio of Letrozole reference standards, pharmacopeial and non-pharmacopeial Letrozole impurities, related compounds, related substances, metabolites, stable isotope-labelled compounds, deuterium labelled compounds and nitrosamine (N-NO) reference standards.

These materials support pharmaceutical research and development, product development, ANDA and DMF submissions, quality control (QC), analytical method development and validation, stability studies, impurity identification, and genotoxic impurity assessment.

Our Letrozole-related reference standards are thoroughly characterized using advanced analytical techniques and are supplied with comprehensive Certificates of Analysis (COA) and supporting analytical data from our USFDA certified, ISO 17025 and ISO 17034 accredited Lab, to meet global regulatory expectations. EP and USP traceable reference standards can also be provided upon request, subject to availability. Simson is also a provider of EP and USP traceable standards. To ensure consistent quality and reliability, our reference standards are periodically re-tested according to established quality management procedures.

Pharmaceutical Reference Standards / Impurity Standards

Letrozole
Letrozole
  • CAT. No.L170000
  • CAS. No.112809-51-5
  • Mol. F.C17H11N5
  • Mol. W.285.30 g/mol
  • Stock Status:Instock
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Letrozole EP Impurity B
Letrozole EP Impurity B
  • CAT. No.L170001
  • CAS. No.113402-31-6
  • Mol. F.C22H13N3
  • Mol. W.319.36 g/mol
  • Stock Status:Instock
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Letrozole EP Impurity A
Letrozole EP Impurity A
  • CAT. No.L170003
  • CAS. No.112809-52-6
  • Mol. F.C17H11N5
  • Mol. W.285.30 g/mol
  • Stock Status:Instock
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Letrozole EP Impurity C
Letrozole EP Impurity C
  • CAT. No.L170004
  • CAS. No.112809-25-3
  • Mol. F.C10H8N4
  • Mol. W.184.20 g/mol
  • Stock Status:Instock
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4-florobenzonitrile
4-florobenzonitrile
  • CAT. No.L170005
  • CAS. No.1194-02-1
  • Mol. F.C7H4FN
  • Mol. W.121.11 g/mol
  • Stock Status:Custom Synthesis
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4,4'-Dicyanobenzophenone
4,4'-Dicyanobenzophenone
  • CAT. No.L170006
  • CAS. No.32446-66-5
  • Mol. F.C15H8N2O
  • Mol. W.232.24 g/mol
  • Stock Status:Custom Synthesis
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Letrozole N-Oxide
Letrozole N-Oxide
  • CAT. No.L170007
  • CAS. No.NA
  • Mol. F.C17H11N5O
  • Mol. W.301.31 g/mol
  • Stock Status:Custom Synthesis
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Letrozole monoacid
Letrozole monoacid
  • CAT. No.L170008
  • CAS. No.NA
  • Mol. F.C17H12N4O2
  • Mol. W.304.31 g/mol
  • Stock Status:Instock
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Letrozole Diacid
Letrozole Diacid
  • CAT. No.L170009
  • CAS. No.1644566-39-1
  • Mol. F.C17H15N3O4
  • Mol. W.323.30 g/mol
  • Stock Status:Instock
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Carbinol Metabolite Of Letrozole
Carbinol Metabolite Of Letrozole
  • CAT. No.L170010
  • CAS. No.134521-16-7
  • Mol. F.C15H10N2O
  • Mol. W.234.25 g/mol
  • Stock Status:Instock
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Glucuronide acid conjuagate
Glucuronide acid conjuagate
  • CAT. No.L170011
  • CAS. No.NA
  • Mol. F.NA
  • Mol. W.NA
  • Stock Status:Custom Synthesis
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Letrozole Diamide
Letrozole Diamide
  • CAT. No.L170012
  • CAS. No.2170106-13-3
  • Mol. F.C17H17N5O2
  • Mol. W.323.36 g/mol
  • Stock Status:Instock
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Letrozole Impurity 3
Letrozole Impurity 3
  • CAT. No.L170013
  • CAS. No.112809-27-5
  • Mol. F.C10H8N4
  • Mol. W.184.20 g/mol
  • Stock Status:Custom Synthesis
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1,4-bis[(4-cyanophenyl)methyl]-1H-1,2,4-triazol-4-ium bromide
1,4-bis[(4-cyanophenyl)methyl]-1H-1,2,4-triazol-4-ium bromide
  • CAT. No.L170014
  • CAS. No.NA
  • Mol. F.C18H14BrN5
  • Mol. W.380.24 g/mol
  • Stock Status:Custom Synthesis
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Letrozole Impurity 7
Letrozole Impurity 7
  • CAT. No.L170015
  • CAS. No.NA
  • Mol. F.C17H15N5O
  • Mol. W.305.33 g/mol
  • Stock Status:Custom Synthesis
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Letrozole Mono-Amide Impurity
Letrozole Mono-Amide Impurity
  • CAT. No.L170016
  • CAS. No.2500927-47-7
  • Mol. F.C17H13N5O
  • Mol. W.303.32 g/mol
  • Stock Status:Instock
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4-(Chloro-1H-1,2,4-triazol-1-ylmethyl)benzonitrile
4-(Chloro-1H-1,2,4-triazol-1-ylmethyl)benzonitrile
  • CAT. No.L170017
  • CAS. No.2451658-74-3
  • Mol. F.C10H7ClN4
  • Mol. W.218.64 g/mol
  • Stock Status:Custom Synthesis
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4,4`-Methylenedibenzonitrile
4,4`-Methylenedibenzonitrile
  • CAT. No.L170018
  • CAS. No.10466-37-2
  • Mol. F.C15H10N2
  • Mol. W.218.25 g/mol
  • Stock Status:Custom Synthesis
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Mixture of Letrozole and Letrozole EP Impurity A
Mixture of Letrozole and Letrozole EP Impurity A
  • CAT. No.L170021
  • CAS. No.NA
  • Mol. F.C17H11N5+C17H11N5
  • Mol. W.570.61 g/mol
  • Stock Status:Instock
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Isotope Labelled Compounds

Letrozole-D4
Letrozole-D4
  • CAT. No.L170002
  • CAS. No.1133712-96-5
  • Mol. F.C17H7D4N5
  • Mol. W.289.33 g/mol
  • Stock Status:Under Synthesis
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Letrozole 13C2 15N2
Letrozole 13C2 15N2
  • CAT. No.L170019
  • CAS. No.NA
  • Mol. F.C1513C2H11N315N2
  • Mol. W.289.28 g/mol
  • Stock Status:Custom Synthesis
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